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There's also OpenTrainTimes https://www.opentraintimes.com/maps/signalling/wat#T_WATRLMN

And https://www.realtimetrains.co.uk/ for precise times/platform information.

And https://www.map.signalbox.io/, which tries to interpolate signal locations onto a geographic map (with the expected level of inaccuracy, though still not half-bad)

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